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What is the domain of f(x) = √(x − 1) + 1/(x − 5)?

Answer and explanation

Correct answer: [1, ∞) − {5}

The domain must satisfy the restrictions from both terms simultaneously. For √(x − 1) to be real, the radicand must be non-negative: x − 1 ≥ 0, so x ≥ 1. The square-root endpoint x = 1 is allowed because √0 exists. For the rational term 1/(x − 5), the denominator must not vanish, so x ≠ 5. Intersecting these conditions gives [1, ∞) with the single point 5 removed, written [1, ∞) − {5}. Therefore option A is correct. Option B wrongly excludes the valid endpoint 1; option C excludes all values at least 5 even though they are valid except for 5; and option D includes values below 1, where the square root is not real. Both restrictions are essential.

Related tags

Relations And FunctionsDomainSquare RootRational FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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